Off Grid Solar Calculator – for Eco-Worthy 20W 12V Solar Panel kit

This Off Grid Solar Calculator will help you calculate the number of batteries and the number of solar panels you need for your offsite cabin or that boat or RV based on the Eco-Worthy 20W Solar Panel Kit.

The calculator has the specifications of the solar panels which come with this kit. You have to choose the batteries you will use. Batteries are not part of the solar panel kit. The other issue is you will most certainly need more than the single panel that comes included in the kit.

The suggested battery is the 12V 35 AH deep cycle SLA Solar battery from Chrome Battery. If you choose another battery, you can change the values of voltage and AH in the calculator shown below the table. This table here shows the default values of the panel wattage, the hours of sunlight, battery voltage in capacity. You can change these values in the calculator.

The calculator is below the table. All the cells in brown in the calculator are editable. The calculator will show the number of panels you need and the number of batteries you will have to buy at the bottom.

Based on the information you entered about the type of panels, batteries and your usage – the calculator will tell you how many panels and batteries you need to power the cabin/RV for 1 day. The calculator will let you know if you need to buy additional panels with your kit and also the number of batteries you will need.

This Solar Panel Kit – Off Grid Calculator assumes you require enough power from the solar panels to charge the batteries from about 50% capacity to a 100% capacity in 1 day. If you discharge your battery to very low levels, it will stop working and you won’t be able to recharge it. Its best not to discharge your battery to below 50%.

It also assumes that you get bright sunlight for the hours you entered into the calculator. If you are up north with shorter days, I would suggest keeping the hours of sunlight at about 4 or less. The number of solar panels and batteries is based on the assumption that the appliances indicated will be used for 1 day on battery power. The solar panels will recharge the batteries to a 100% every day after the panels will produce enough power to recharge the battery to a 100% in one day.

You can also see a calculator for other solar panel kit by clicking on the links beside each solar panel kit graphic.

Disclaimer :- This calculator is for illustration purposes only. Results are approximate. Location, hours of sunlight and battery conditions and maintenance will affect results. Your comments are welcome.

I usually advice a 100W solar panel based kit as a good mid sized unit which is good value and has reasonable power output. Of course you will need to evaluate your needs first – but my two cents for a size are the 100W kits. Thanks for visiting http://mysolarhome.us

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